Plug-type multipolar electrical connector

Abstract

A plug-type multipolar electrical connector is arranged such that a composite cable comprising, as core wires, thin and thick wires can be connected to respective terminal pins in a limited space and that a shielding operation as an anti-noise measure is improved. Thus, the plug-type multipolar electrical connector can be miniaturized with higher density and improved in shielding performance. The horizontal pitch between each adjacent terminal pin for thick wires is coarser or greater than the horizontal pitch between each adjacent terminal pin for thin wires. A terminal pin group for thin wires is disposed at the center of a body, and a terminal pin group for thick wires is disposed at a lateral side of the terminal pin group for thin wires. The terminal pin groups are enveloped by shield covers.

What is claimed is: 
     
       1. A plug-type multipolar electrical connector having a body made of an insulating material in which a plurality of projecting terminal pins are assembled, said plurality of terminal pins comprising:   a terminal pin group for thin conductors in which a plurality of terminal pins are disposed at the center of said body with the horizontal pitch between each adjacent terminal pin being fine;   a terminal pin group for thick conductors in which a plurality of terminal pins are disposed at a lateral side of said terminal pin group for thin conductors with the horizontal pitch between each adjacent terminal pin being greater than the horizontal pitch between adjacent terminal pins of the terminal group for said thin conductors;   a first shield cover made of a metallic plate and so disposed as to surround the body, the terminal pin group for thin conductors and the terminal pin group for thick conductors;   a ring body fittingly placed on a composite cable in which a braided shell shield surrounds core wires comprising thin conductors and core wires comprising thick conductors; and   a second shield cover having, in a unitary structure,   an attaching neck portion fittingly placed on said ring body attached to said composite cable, a portion of said braided shell shield folded back on the outer surface of said ring body being held by and between said attaching neck portion and said ring body, and   a fitting case portion extending from said attaching neck portion and fitted to said first shield cover, wherein:   said first shield cover has a rear end portion said rear end portion being fitted to the fitting case portion of the second shield cover;   said second shield cover having a rearward direction and engagement pawls which are cut and inwardly turned and which are opened in the rearward direction, said engagement pawls being engaged with corresponding engagement holes formed in said first shield cover; and   said first shield cover has engagement pawls opened in the rearward direction, said engagement pawls being engaged with the front end edge of the fitting case portion,   whereby said first shield cover is connected to said second shield cover.   
     
     
       2. A plug-type multipolar electrical connector having a body made of an insulating material in which a plurality of projecting terminal pins are assembled, said plurality of terminal pins comprising:   a terminal pin group for thin conductors in which a plurality of terminal pins are disposed at the center of said body with the horizontal pitch between each adjacent terminal pin being fine;   a terminal pin group for thick conductors in which a plurality of terminal pins are disposed at a lateral side of said terminal pin group for thin conductors with the horizontal pitch between each adjacent terminal pin being greater than the horizontal pitch between adjacent terminal pins of the terminal group for said thin conductors;   a first shield cover made of a metallic plate and so disposed as to surround the body, the terminal pin group for thin conductors and the terminal pin group for thick conductors;   a ring body fittingly placed on a composite cable in which a braided shell shield surrounds core wires comprising thin conductors and core wires comprising thick conductors;   a second shield cover having, in a unitary structure,   an attaching neck portion fittingly placed on said ring body attached to said composite cable, a portion of said braided shell shield folded back on the outer surface of said ring body being held by and between said attaching neck portion and said ring body,   locking members each having a front end and a base end, said locking members forming a unitary structure, with resilient movable pieces provided at the front ends thereto said resilient movable pieces having projection, and with holding frames at the base ends thereof, said holding frames having spaces for housing spring members;   sliders each forming a unitary structure, said sliders having base portions longitudinally movably fitted to a respect one of said holding frames of said locking members, said base portions having a front end, and slide pieces extending from said base portions throughout the back sides of said movable pieces in an overlapping manner;   spring members disposed in said spaces for housing spring members in said holding frames between said base, portions of said sliders and spring receiving portions formed at said holding frames, said spring members normally biasing said sliders in a forward direction;   a sleeve longitudinally slidably placed on and fitted to said first shield cover, said sleeve having an engagement portion which is engageable, only from the front side thereof, with the front ends of said base portions of said sliders: and   a fitting case portion extending from said attaching neck portion and fitted to said first shield cover, wherein:   said first shield cover has a pair of lateral plates extending in the longitudinal direction;   said pair of lateral plates having openings formed therein, said openings defining rear end, edges and openings extending in the longitudinal direction of said lateral plates;   said locking members being fitted to said openings with said projections of said movable pieces projecting from said lateral plates of said first shield cover;   said holding frames of said locking members being engaged with the rear end edges of said openings; and   the engagement portions of said front ends of said base portions of said sliders with said engagement portion of said sleeve, being located rearward with respect to said projections of said movable pieces.   
     
     
       3. A plug-type multipolar electrical connector according to claim 2, wherein the openings have forward narrow-width parts and rearward wide-width parts, the movable pieces of the locking members being housed in said narrow-width parts and the holding frames of said locking members being housed in said wide-width parts. 
     
     
       4. A plug-type multipolar electrical connector according to claim 2, wherein the lateral plates of the first shield cover have an outer surface around the openings, and wherein the holding frames of the locking members have pairs of upper and lower flat plates which form the spaces for housing spring members, and flange portions formed by bending said flat plates, said flange portions being opposite to and coming in contact with the outer surfaces around the openings of the lateral plates of the first shield cover. 
     
     
       5. A plug-type multipolar electrical connector according to claim 3, wherein the lateral plates of the first shield cover have an outer surface around the openings, and wherein the holding frames of the locking members have pairs of upper and lower flat plates which form the spaces for housing spring members, and flange portions formed by bending said flat plates, said flange portions being opposite to and coming in contact with the outer surfaces around the openings of the lateral plates of the first shield cover. 
     
     
       6. A plug-type multipolar electrical connector according to claim 2, further having a cover portion and a case portion for strain relief, said cover portion being placed on the second shield cover, said case portion covering the composite cable, the rear end portion of the sleeve slidably covering said cover portion of said strain relief.